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| Titel |
Nitrate removal in a restored riparian groundwater system: functioning and importance of individual riparian zones |
| VerfasserIn |
S. Peter, R. Rechsteiner, M. F. Lehmann, R. Brankatschk, T. Vogt, S. Diem, B. Wehrli, K. Tockner, E. Durisch-Kaiser |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 11 ; Nr. 9, no. 11 (2012-11-06), S.4295-4307 |
| Datensatznummer |
250007376
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| Publikation (Nr.) |
 copernicus.org/bg-9-4295-2012.pdf |
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| Zusammenfassung |
| For the design and the assessment of river restoration projects, it is
important to know to what extent the elimination of reactive nitrogen (N) can
be improved in the riparian groundwater. We investigated the effectiveness of
different riparian zones, characterized by a riparian vegetation succession,
for nitrate (NO3−) removal from infiltrating river water in a
restored and a still channelized section of the river Thur, Switzerland.
Functional genes of denitrification (nirS and nosZ) were
relatively abundant in groundwater from willow bush and mixed forest
dominated zones, where oxygen concentrations remained low compared to the
main channel and other riparian zones. After flood events, a substantial
decline in NO3− concentration (> 50%) was observed in the
willow bush zone but not in the other riparian zones closer to the river. In
addition, the characteristic enrichment of 15N and 18O in the
residual NO3− pool (by up to 22‰ for δ15N and up
to 12‰ for δ18O) provides qualitative evidence that the
willow bush and forest zones were sites of active denitrification and, to a
lesser extent, NO3− removal by plant uptake. Particularly in the
willow bush zone during a period of water table elevation after a flooding
event, substantial input of organic carbon into the groundwater occurred,
thereby fostering post-flood denitrification activity that reduced
NO3− concentration with a rate of ~21 μmol N l−1 d−1. Nitrogen removal in the forest
zone was not sensitive to flood pulses, and overall NO3− removal
rates were lower (~6 μmol l−1 d−1). Hence,
discharge-modulated vegetation–soil–groundwater coupling was found to be a
key driver for riparian NO3− removal. We estimated that, despite
higher rates in the fairly constrained willow bush hot spot, total
NO3− removal from the groundwater is lower than in the extended
forest area. Overall, the aquifer in the restored section was more effective
and removed ~20% more NO3− than the channelized section. |
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